Screw.



H. G. REINIGER.

SCREW.

APPLICATION FILED SEPT. 16, 1910.

Patented Feb. 21, 1911.

- E STAWENT OFFICE- HENRY e. REINIGER, or RATHDRUM, IDAHO.

- SCREW.

To all whom it may concern.'.

Be it known that I, HENRY G. REINIGER, a citizen of the United States,residing .at Itathdrum, in the county of Kootenai and State of Idahohave invented certain new and useful Improvements in Screws, of whichthe following is a specification.

The invention re ates to improvements in screws such as are employed. infastening together stove-pipe sections.

It has for its object the provision of a device that can be easilyapplied and removed and which, when in place, will be secure againstaccidental displacement.

It consists of a screwof the novel construction hereinafter described,pointed out in the appended claims, and illustrated in the accompanyingdrawings.

In the accompanying drawings, in which similar reference charactersdesignate corresponding parts, Figure 1 is a side elevation of a screwembodyingthe invention. Fig. 2 shows the screw applled to a -joint. I

The shank a of the screw tapers toward its point 5, and is-provided witha thread 0 square in cross-section. The outer -extremity d of the threadends a short distance from the point b, and the inner e'xtremity e endsat the shoulder f of the shank a short .distance from the head 9 of thescrew. The head 9 is of the usual formation except that it'has 'abeveled inner face h.

Between the heady .and the shoulder f is the neck a of reduced diameter,the latter gemngxlees than the diameter of the threaded In applying thescrew the end of one pi e-- section 1s inserted in the end of anot er sothattheir edges overlap, and by means of asultable implement coincidentholes are punched through the metal. of the overlapplng edges. Thecoincidentholes should be of less diameter than thethreaded shank,

but sufiicie'ntly large to admit the point" I). After the holes havebeenformed the point 5 is inserted and the shank forced: in until theouter extremity d of the thread engages the-' edges of the metal of theoverlapping pipesections. Then by means of a screw-driver the screw isturned through-the coincident holes until theedges 'of the metal clearthe shoulder f and spring around the reduced .neck 5.

As the neck 71 has less diameter than the threaded shank and as themetal around the holes has contracted, the screw -cannot be shaken looseor otherwise accidentally displaced.

To remove the screw, a flat .implement such as a screw-driver isinserted between the beveled face h of the head and the pipesection toslightly force outwardly the screw so that the extremity e of the threadwill engage the edge of the metal. At the .same

; time by means of a screw-driver the screw is turned until the threadengages the metal of the pipe and the screw is turned out of the,coincident openings. As soon as the ex- Specification of Letters Patent.Patented Feb. 21, 1911. Application filedSeptemher 16, 1910. I SerialNo. 582,357.

tremity e engages the edge of the metal of the pipe the blade can beremoved from beneath the head of the screw.

Having thus described my invention, what I claim and .desire to secureby Letters-Patent is,

1. A screw comprising a head, a pointed shank, a thread extending alongthe shank with its extremities ending short distances from the head andpointed end respectively, and a neck between the inner extremityof thethread and the head, said neck being of less diameter than the threadedshank.-

2. A screwcomprising a head with a-bev-- eled inner face, a pointedshank having a shoulder near its inner end a short distance from thehead, aneck of reduced diameter betweenthe shoulder and head, and athread shank.

In testimony whereof I hereunto aflix my Witnesses:

. Gnome F. WnLnnLMY,

'LILA M. Lama.

86 i on the shank extending from the shoulder to ,within a shortdistance of the point of the

